img

官方微信

img

群号:冰川冻土交流群

QQ群:218834310

高级检索

冰川冻土 ›› 2016, Vol. 38 ›› Issue (5): 1317-1324.doi: 10.7522/j.issn.1000-0240.2016.0154

• 寒区科学与技术 • 上一篇    下一篇

温度和含水状态对岩石劈裂强度影响的试验研究

王冲1,2, 赖远明2, 尤哲敏2, 杨勇3, 余东合4, 刘国华4   

  1. 1. 兰州大学 土木工程与力学学院, 甘肃 兰州 730000;
    2. 中国科学院 寒区旱区环境与工程研究所 冻土工程国家重点实验室, 甘肃 兰州 730000;
    3. 中国石油华北油田公司, 河北 任丘 062552;
    4. 中国石油华北油田公司 采油工程研究院, 河北 任丘 062552
  • 收稿日期:2016-05-03 修回日期:2016-07-22 出版日期:2016-10-25 发布日期:2017-01-22
  • 通讯作者: 赖远明,E-mail:ymlai@lzb.ac.cn. E-mail:ymlai@lzb.ac.cn
  • 作者简介:王冲(1990-),男,湖北监利人,2012年毕业于兰州大学,现为兰州大学在读博士研究生,从事冻土力学和寒区工程方面的研究.E-mail:chwang13@lzu.edu.cn
  • 基金资助:

    国家自然科学基金项目(41230630);中国科学院“西部行动计划”项目(KZCX2-XB3-19);国家重点基础研究发展计划(973计划)项目(2012CB026102);中国石油华北油田公司采油工程研究院项目(HBYT-CYY-2014-JS-90)资助

Experimental study of the effect of temperature and moisture state on rock Brazilian splitting strength

WANG Chong1,2, LAI Yuanming2, YOU Zhemin2, YANG Yong3, YU Donghe4, LIU Guohua4   

  1. 1. School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China;
    2. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
    3. PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China;
    4. Petroleum Production Engineering Research Institute of PetroChina Huabei Oilfield Company, Renqiu 062552, Hebei, China
  • Received:2016-05-03 Revised:2016-07-22 Online:2016-10-25 Published:2017-01-22

摘要:

岩土类材料的强度强烈依赖于含水率和温度条件.以兰州兰山砂岩为研究对象,分别进行了不同温度(+20℃、-5℃、-10℃)和不同含水率(干燥、天然含水率和饱和状态)条件下岩石的巴西圆盘劈裂试验.试验结果表明,常温下,岩石抗拉强度随含水率增加而急剧减小,试样饱和时软化、崩解,丧失承载能力;在不同负温条件下,天然含水状态的试样抗拉强度最大,干燥状态下最小;在-10~+20℃范围内,干燥岩石强度随温度升高,抗拉强度增大,含水岩石均是随温度升高,抗拉强度减小,但饱和岩石在-5℃时抗拉强度最大.含水率和温度对岩样强度的影响存在临界值,超过临界值,岩样强度随上述因素反向变化.试验结论为岩土类材料劈裂强度的标准化测试及其工程应用提供了重要的基础数据参考.

关键词: 岩石力学, 巴西劈裂试验, 温度, 含水率, 抗拉强度

Abstract:

The tensile strength of rock depends on moisture contents and temperatures. In order to study the mechanical properties of sandstone sampled from Lanzhou, Brazilian splitting test was carried out to investigate sandstone's tensile strength under different temperatures (+20℃, -5℃, -10℃) and different moisture contents (dry, natural and saturated). The test results showed that the tensile strength of sandstone decreases sharply with moisture content, until it softens to disintegration and loses bearing capacity due to saturation. When temperature less than 0℃, the specimens at natural water state has tensile strength always higher than those at dry state. When temperatures change between -10℃ and +20℃, the tensile strength of dry rock increases with temperature, but the tensile strength of saturated rock reaches the maximum at -5℃. There are critical values for the moisture content and temperature effects, exceed the critical values, the relationship between the tensile strength of the rock and the moisture content or temperature will be inverted. These results will be useful for testing the tensile strength of rock and forecasting rock strength.

Key words: rock mechanics, Brazilian splitting test, temperature, moisture content, tensile strength

中图分类号: 

  • TU458+.3